SKU: 84483002319

Witty Pi 4 Mini: Realtime Clock and Power Management for Raspberry Pi

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Description

Witty Pi 4 Mini: Realtime Clock and Power Management for Raspberry PiWitty Pi 4 Mini is an uHAT shaped add on board that adds realtime clock and power management to your Raspberry Pi. Free shipping on this item!!! Witty Pi is an add on board that adds realtime clock and power management to your Raspberry Pi. It can define your Raspberry Pis ON OFF sequence, and significantly reduce the energy usage. Witty Pi 4 Mini is the fourth generation of Witty Pi and it has these hardware resources onboard: Factory calibrated and

Witty Pi 4 Mini is an uHAT shaped add-on board that adds realtime clock and power management to your Raspberry Pi.

 

Free shipping on this item!!!

 

Witty Pi is an add-on board that adds realtime clock and power management to your Raspberry Pi. It can define your Raspberry Pi’s ON/OFF sequence, and significantly reduce the energy usage. Witty Pi 4 Mini is the fourth generation of Witty Pi and it has these hardware resources onboard:

  • Factory calibrated and temperature compensated realtime clock with ±2ppm accuracy.
  • Dedicated temperature sensor with 0.125 °C resolution.
  • AVR 8-bit microcontroller (MCU) with 8 KB programmable flash.

Witty Pi 4 Mini has very similar design with Witty Pi 4, however it doesn’t come with a DC/DC converter onboard, and it uses super capacitor for RTC time keeping when no power supply is connected. Witty Pi 4 Mini has solder pads on the back, which allow you to solder a DC/DC converter (LDO or switching DC/DC converter) there.

ACCURATE REALTIME CLOCK AND ON/OFF SCHEDULING

The realtime clock (RTC) on Witty Pi 4 Mini has been calibrated in the factory and Witty Pi 4 Mini’s firmware also makes temperature compensation for the crystal. This makes the RTC very accurate and the actual annual error is limited within ±2ppm. When your Raspberry Pi boots up, the time stored in the RTC will overwrite the system time. As a result, your Raspberry Pi knows the correct time even without accessing the Internet. You can schedule the startup and/or shutdown of your Raspberry Pi, and make it a time-controlled device. You can even define a schedule script to schedule complicated ON/OFF sequence for your Raspberry Pi.

Scheduling the ON/OFF sequence for Raspberry Pi is the most popular feature of Witty Pi, and it is extremely useful for systems that powered by battery. By only turning on Raspberry Pi when necessary, the battery can be used way much longer with Witty Pi installed.

TEMPERATURE CONTROLLED DEVICE

The temperature sensor on Witty Pi 4 Mini has 0.125 °C resolution. The temperature data is used for compensating the crystal and make the RTC more accurate.

You can also specific the action (startup or shutdown) when temperature goes above or below the preset threshold. Which means you can also make your Raspberry Pi a temperature-controlled device.

E-LATCHING POWER SWITCH

Witty Pi 4 Mini implements an e-Latching power switch, which is very similar to the power switch on your PC/laptop computer. You can gracefully turn on/off your Raspberry Pi with a single tap on the button. The software running in background will execute the shutdown command before the power gets cut, and it avoids the data corruption caused by “hard” shutdown.

SINGLE I2C DEVICE

Witty Pi 4 uses MCU to emulate a single I2C device with default address 0x08, and also map all I2C registers in realtime clock and temperature sensor as virtual I2C registers in the same device. You can access all I2C registers in realtime clock and temperature sensor via the single I2C device emulated by Witty Pi 4.

The advantage of this new design is that Witty Pi 4 hides other I2C devices (realtime clock, temperature sensor) and becomes the proxy of them to talk to Raspberry Pi. Because the I2C address used by Witty Pi 4 can be changed to any value, you can always avoid the I2C address conflicting.

UWI SUPPORT

Witty Pi 4 Mini is fully supported by UWI (UUGear Web Interface), and you can access you Witty Pi 4 Mini from any device that have network access.

SOFTWARE INSTALLATION:

Witty Pi 4 Mini uses the same software as Witty Pi 4. You just need to run these two commands in your Raspberry Pi to install Witty Pi 4 Mini’s software:

pi@raspberrypi:~ $ wget https://www.uugear.com/repo/WittyPi4/install.sh
pi@raspberrypi:~ $ sudo sh install.sh

The software and firmware of Witty Pi 4 Mini are open-sourced. You can find the source code on GitHub.

PACKAGE CONTENT:

Each Witty Pi 4 Mini package contains:

  • Witty Pi 4 Mini board x 1
  • M2.5 x 10mm plastic screws x 4
  • 4mm plastic spacer x 4
  • M2.5 plastic nut x 4
Shipping Notes
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Exchange/Return Notes
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SKU: 84483002319

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4.6 ★★★★★
Based on 16 reviews
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D
Verified Purchase
David
Lowell, US
★★★★★ 5
Used for a year.
Color: Black
Had this in a back pack for a year and wow. The dirt collected is kinda shocking. I will buy more of these for different bags!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 21, 2026
L
Verified Purchase
Lisa W
Massapequa, US
★★★★★ 5
Fun little gadget we never knew we needed.
Color: Pink
Who knew keeping our bags and purses could be so easy. Easy to clean once it does it's "job". Doesn't take up much room and works like a charm
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 31, 2026
T
Verified Purchase
Tina
Louisville, US
★★★★★ 3
Mixed Results - Sauberkugel Clean Ball Review
Color: Bag Petrol
I purchased the Sauberkugel Clean Ball in Teal to help keep my bags clean from dust, dirt, and crumbs, and while it had some positive aspects, I can only give it a moderate 3-star rating due to a few shortcomings. On the plus side, the concept of the sticky inside ball is ingenious and showed promise. It did manage to pick up some dust and small particles (including glitter) from my purse which was a relief. The teal color is cute and made it easier to spot in a bag. However, there were some limitations that affected its overall effectiveness. *It seemed to struggle with picking up certain types of debris, particularly larger crumbs, heavier dirt, and ever some larger glitter/confetti pieces. This inconsistency was a bit disappointing as I had hoped based on the ads for it to be much more effective. *Another major issue I encountered was the difficulty of opening and cleaning the ball. The design was supposed to make it relatively easy to open and clean (as the ads lead me to believe). However I was unable to get the ball unlatched - which made it quite challenging to clean fully. It was frustrating to wrestle with the ball and being unable open to clean it out fully. In summary, while the Sauberkugel Clean Ball had its merits and did manage to capture some unwanted particles, it fell short in terms of consistency and ease of use. The struggle to open and clean the ball was a significant drawback for me.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on August 29, 2023
N
Verified Purchase
N. Glaze
Carnegie, US
★★★★★ 5
Great item, totally worth it.
Color: Black
I've used this for over a year now in my nice work purse to keep those tiny dirt particles from who-knows-where (you know the ones I mean!) from mysteriously getting in the bottom of of it. It rolls around easily in its plastic case either naturally (without getting goopy or leaky) or rolled by hand. Handiest thing I've ever bought to help keep my purse clean!
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Reviewed in the United States on December 23, 2025
M
Verified Purchase
Matthew Vincent
Houston, US
★★★★★ 5
Simple and Effective Remote Organization
Color: Black, Size: Small
The Pros: Spacious Design: With five deep pockets, there is plenty of room to store everything from TV and soundbar remotes to reading glasses. Functional and Steady: It sits perfectly on a side table without tipping over. It does exactly what I hoped it would do by keeping all our remotes in one spot. Great Portability: It is lightweight enough to move around easily, which is helpful for keeping things organized while we are on the move. Clean Finish: The material looks professional and blends in well with the furniture without looking like a cheap plastic holder. The Cons: Pocket Depth: One thing to keep in mind is that the pockets are fairly deep. If you have very small remotes, they can slide down a bit far, making them slightly trickier to grab quickly. Bottom Line: This is a straightforward, no-fuss solution if you are tired of losing remotes in the couch cushions. It is well-made, looks good, and simply works. I would definitely recommend it to anyone looking to declutter their living space.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 12, 2026

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